What is the property called that determines if an object is heavy or light?
density
Density depends on what two things?
Mass and volume
What is the mathematical equation for density?
d = m/v
If two cubes have the same volume, but different masses how will that affect their density? Which one will be more dense than the other?
The more mass something has the more dense it is. Therefore, the one with the larger mass will be most dense.
Atoms, mass, are two reasons an object might have a different density. What is one more reason?
Volume - when a substance like a solid or a liquid is heated, its molecules move faster and get slightly further apart. The substance still has the same mass but it takes up a larger volume.
Atoms, Volume, Mass arrangement are 3 reasons an object might have a different density? Can you explain by describing the formation of ice?
When water gets below 4°C, its molecules actually begin getting a little further apart as they orient themselves into the crystal structure of ice. Since the mass does not change but the ice occupies a larger volume than the water, the density of ice is less than the density of water. This is why ice floats in water.
Can a large piece of a substance with a low density weigh the same amount as a small piece of a substance with a high density?
Yes
What is mass?
It is the amount of matter
What is weight?
Gravity’s pull
Why does a cube of copper that is the same size as a cube of plastic have a higher density?
Copper has more mass.
How does the water displacement method work for finding the volume of an object?
Volume of displaced water = volume of object.
Is the density of a substance the same or different depending on the size of a sample?
The same
Why do objects sink or float in liquids? Provide an example with water.
More dense = sink
Lower density = float
Can liquids sink or float in other liquids?
Yes. For example, alcohol will float on oil, oil will float on water.
What happens to the density of water when you add salt to it?
It becomes more dense
Can a material that is more dense than water float? Why or why not?
Yes because shape is also a factor. Example - a ship can float in water.
How do you think density applies to weather?
Warm air has lower density compared to cooler air, and as the temperature increases, the density of the air decreases
